AstroNote 2021-14

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2021-01-13 17:06:46
Type: Object/s-Discovery/Classification
ePESSTO+ spectroscopic classification of optical transients
Authors: K. W. Smith, M. Fulton, J. Gillanders, S. Srivastav (QUB), C. Barbarino, S. Yang, T.-W. Chen (Stockholm), I. Arcavi (Tel Aviv), C. Gutierrez (Turku), J. Anderson (ESO), T. Müller Bravo (Southampton), M. Gromadzki (Warsaw), C. Inserra (Cardiff), E. Kankare (Turku), M. Nicholl (Birmingham), O. Yaron (Weizmann), I. Manulis (Weizmann), D. Young (QUB), J. Tonry, L. Denneau, A. Heinze, H. Weiland (IfA, Univ. of Hawaii), B. Stalder (LSST), A. Rest (STScI), S. J. Smartt, O. McBrien (QUB)
Source Group: ePESSTO+
This report includes classifications of 1 Type Ia and 1 Type II. 2021zj is likely a young SN II showing flash ionisation signatures. We encourage followup observations.

ePESSTO+, the advanced Public ESO Spectroscopic Survey for Transient Objects (Smartt et al. 2015 2015A&A...579A..40S), reports the following supernova classifications.

Targets were supplied by the ATLAS survey (Smith et al. 2020 2020PASP..132h5002S) and the Zwicky Transient Facility ZTF (Bellm et al. 2019 2019PASP..131a8002B) - data stream processed through the Lasair broker (Smith, Williams, Young et al. 2019 2019RNAAS...3a..26S).

Observations were performed on the ESO New Technology Telescope (NTT) at La Silla on the night of 2021 January 12, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were obtained using SNID (Blondin & Tonry 2007 2007ApJ...666.1024B) and GELATO (Harutyunyan et al. 2008 2008A&A...488..383H) and Superfit (Howell et al. 2005 2005ApJ...634.1190H).

The classification spectra and additional details can be obtained from (via WISeREP) and the IAU Transient Name Server.

The classified objects are listed in the Related Objects table below.

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftSourcePhase (days)RemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2021wh [ATLAS21bbs]09:37:54.204-20:06:40.84SN Ia0.03-3 to -6redshift from SNID09:37:54.205-20:06:40.72SN Ia0.035
TNS2021zj [ZTF21aadkhte]11:16:32.733+29:05:45.88SN II0.046WISEA J111632.92+290546.40.046Known host redshift. Blue continuum and flash ionisation features. Young SN II or 1998S-like IIn?11:16:32.710+29:05:46.14SN II0.046